Defensive publication



QCDA g DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published atthe request of the applicant or owner in accordance with the Notice ofApr. 11, 1968, 849 O.G. 1221. Identification is by serial number of theapplication and the heading indicates the number of pages ofspecification, including claims, and of sheets of drawing contained inthe application as originally filed. The file of this application isavailable to the public for inspection; reproduction may be purchasedfor '30 cents per sheet.

Applications published under the Defensive Publication Program have notbeen examined as to the merits of alleged invention. The Patent Oflicemakes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 22, 1969 861 O.Gr. 1021 788,076 HEXAHYDRO 4,6DHMINO-S-TRIAZINE-Z- THIONE DERIVATIVES AS ANTIFOGGANTS FOR PHOTOGRAPHICMATERIALS Norman Wayne Kalenda and Dorothy Johnson Beavers, both ofKodak Park Division, Rochester, N.Y. 14650 Filed Dec. 30, 1968.Published Apr. 22, 1969 Class 96-109 No Drawing. 8 Pages SpecificationPhotographic silver halide emulsions are stabilized against fog withhexahydro 4,6 diimino s triazine 2- thione derivatives having theformula:

s s Y HN NH

